Middle Island, New York, United States [CDP]; population was 7,848 in 1990; housing units was 3,184 in 1990; location is 40°53'N 72°57'W; land area is 8.25 square miles (5,281 acres); water area is 0.07 square miles (42 acres); FIPS code is 46976 [SourceCBP]